I don't trust purpose-built external hard drives for backup. Lots of little problems with those: Cheap drives, poor cooling, fragile USB micro connectors, failure-prone I/O boards, and short warranties. WD My Books in particular can be trouble if the I/O board goes, because the entire drive is hardware-encrypted, whether you use that feature or not.

Buying an internal drive and external enclosure is preferred.

That said, I do have a 1TB My Book and a 1TB Passport, but the My Book is a third redundant backup (Behind an internal drive and a hotswap drive) and the Passport is just for moving data around.

i do have an instagram but I hardly ever use it. (Maybe because my 3GS camera blows) Honestly it is a great tool for photographers, the idea of having a camera with you at all times is great. It is a fad and it will pass...eventually